What it is and where it fits
The Siemens 3VA1180-4EF32-0AE0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — it sits in the main distribution panel or downstream feeder to protect cables and busbars from overloads and short circuits. Three poles, rated 80 A at 40 °C with a thermal-magnetic TM240 overcurrent release, and a maximum interrupting rating of 121 kA at 240 V AC. That 121 kA is the high-end SCCR for this frame; at 415 V it still breaks 75.6 kA, and at 690 V it holds 11.9 kA. Insulation voltage rated 800 V, so it handles 480/600 V distribution without derating the insulation.
Key ratings — what they mean for the panel
The 80 A continuous rating at 40 °C is the thermal baseline; above 55 °C you start to derate — 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. If your panel ambient runs hot, that derate is the number to coordinate with the upstream feeder. The 121 kA at 240 V is the peak short-circuit capacity — it safely interrupts a fault up to that level without welding contacts or cascading failure upstream. At 415 V (common in European industrial distribution) it still clears 75.6 kA, which covers most transformer-fed installations. The 800 V rated insulation voltage means it can be applied on 690 V systems (e.g., mining or marine) without additional series protection.
Integration and mounting
The breaker mounts on a DIN rail or can be screw-fixed to a backplate — the 70 mm depth and 76.2 mm width (3 in) fit standard SENTRON panel cutouts. It ships with a TM240 release and accepts up to four auxiliary switches (HQ design) for remote status feedback. No undervoltage release or shunt trip is fitted from the factory; those are field-addable options if your safety circuit requires a shunt trip.